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Seasonal Growth Responses of the Seagrass Zostera marina under Severely Diminished Light Conditions

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Abstract

Acute light attenuation events, such as those caused by red tide algal blooms or inflows of turbid plumes during monsoonal rains, are occurring with increased frequency in coastal waters. To explore seasonal growth responses of the seagrass Zostera marina to such severe light reduction events, we reduced radiation reaching Z. marina shoots by in situ shading with neutral density screens over 6-week periods in each of four seasons. Underwater photon flux densities (PFDs) in the shaded cages were reduced to 4.0–17.2 % of unshaded control values. Water temperatures ranged from 8.2 °C in the winter to 23.2 °C in the summer over the experimental period. Under reduced light, the aboveground biomass of Z. marina usually decreased more rapidly than belowground biomass. By the end of each experiment, total biomass had decreased to ~10 % of the control biomass in the summer, fall, and winter periods but to ~50 % of controls during spring. Detrimental effects of light reduction on seagrass growth were most severe in summer and least severe in spring. Thus, Z. marina is more susceptible to the negative effects of light reduction when water temperatures are high. Since red tide algal bloom events and turbid plumes usually occur during high water temperature periods in summer, these light attenuation events are likely major drivers of observed Z. marina declines in coastal areas.

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Acknowledgments

We thank JH Kim, JW Kim, SH Park, and SR Park for their many hours of field and laboratory assistance. Anonymous reviewers provided extremely helpful comments on an earlier version of this manuscript. This work was supported by the Ministry of Oceans and Fisheries, Korea (Project title: Long-term change of structure and function in marine ecosystems of Korea), and by a National Research Foundation of Korea (NRF) grant provided by the Korean government (MEST; NRF-2012R1A1A2004493).

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Correspondence to Kun-Seop Lee.

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Kim, Y.K., Kim, S.H. & Lee, KS. Seasonal Growth Responses of the Seagrass Zostera marina under Severely Diminished Light Conditions. Estuaries and Coasts 38, 558–568 (2015). https://doi.org/10.1007/s12237-014-9833-2

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